Thershold value for SI analysis in encounter tool

[viswanadh_babu]

Hi every one,

In encounter , if i specify noise thershold as 20% VDD, then it is stated in the mannuals that if volatge exceeds 20 % of VDD , the tool will consider it as glicth.
i.e. if a logic zero signal is present on a net and if the signal apperas to be { ligic 0 + 20%of vdd } but, if logic 1 is present then what is the situation.

Regards,
Vb

 

[shitansh]

hi,

if signal is logic 1 then its value will be vdd but if logic level changes form 0 to 1 then there will be overshoot while reaches to logic1 and after some time it will be stable at vdd.

hth

 

[raki31]

Hi every one,

In encounter , if i specify noise thershold as 20% VDD, then it is stated in the mannuals that if volatge exceeds 20 % of VDD , the tool will consider it as glicth.
i.e. if a logic zero signal is present on a net and if the signal apperas to be { ligic 0 + 20%of vdd } but, if logic 1 is present then what is the situation.

Regards,
Vb

If the logic 1 is present on the net the signal shd be within this limit { logic VDD - 20% of VDD} then there will be no problem....otherwise it flags an errors indicating glitch is present.........thanku

 

[juggenaut]

then we need to consider 1-20%(VDD) , if it seems to be less than that value then

flags an error. as glitch.

thanq>......: